DE3238651C2 - Method for producing a tight fold connection - Google Patents

Method for producing a tight fold connection

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Publication number
DE3238651C2
DE3238651C2 DE3238651A DE3238651A DE3238651C2 DE 3238651 C2 DE3238651 C2 DE 3238651C2 DE 3238651 A DE3238651 A DE 3238651A DE 3238651 A DE3238651 A DE 3238651A DE 3238651 C2 DE3238651 C2 DE 3238651C2
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DE
Germany
Prior art keywords
heat
heat treatment
supply
sealing
bead
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
DE3238651A
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German (de)
Other versions
DE3238651A1 (en
Inventor
Bernd 3170 Gifhorn Knabe
Klaus 3180 Wolfsburg Könn
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Volkswagen AG
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Volkswagen AG
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Publication date
Application filed by Volkswagen AG filed Critical Volkswagen AG
Priority to DE3238651A priority Critical patent/DE3238651C2/en
Publication of DE3238651A1 publication Critical patent/DE3238651A1/en
Application granted granted Critical
Publication of DE3238651C2 publication Critical patent/DE3238651C2/en
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3604—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/3608—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint comprising single particles, e.g. fillers or discontinuous fibre-reinforcements
    • B29C65/3612—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint comprising single particles, e.g. fillers or discontinuous fibre-reinforcements comprising fillers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/483—Reactive adhesives, e.g. chemically curing adhesives
    • B29C65/4835—Heat curing adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/135—Single hemmed joints, i.e. one of the parts to be joined being hemmed in the joint area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
    • B60R13/06—Sealing strips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D27/00—Connections between superstructure or understructure sub-units
    • B62D27/02—Connections between superstructure or understructure sub-units rigid
    • B62D27/026—Connections by glue bonding
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
    • C09J5/06—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving heating of the applied adhesive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1403—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the type of electromagnetic or particle radiation
    • B29C65/1412—Infrared [IR] radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3604—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/3656—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint being a layer of a multilayer part to be joined, e.g. for joining plastic-metal laminates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
    • B29C66/024—Thermal pre-treatments
    • B29C66/0242—Heating, or preheating, e.g. drying
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
    • C09K2200/06—Macromolecular organic compounds, e.g. prepolymers

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Sealing Material Composition (AREA)
  • Automobile Manufacture Line, Endless Track Vehicle, Trailer (AREA)

Abstract

Zur Feinabdichtung einer Falzverbindung (3), in deren Falzspalt (5) ein durch Wärmezufuhr härtbarer Bördelnahtkleber (6) angeordnet ist, wird auf die freie Schnittkante (4) der Falzverbindung eine Dichtraupe (7) aus einem gelier- bzw. härtbarem Material aufgetragen und durch zwei Wärmebehandlungen geliert bzw. gehärtet, von denen die erste Wärmebehandlung in einer Wärmezufuhr von außen, beispielsweise durch Infrarot-Bestrahlung, und die zweite Wärmebehandlung in einer Wärmezufuhr von innen von den metallenen Teilen (1, 2) der Falzverbindung (3) durch induktive Aufheizung bestehen. Dadurch wird eine schnelle Härtung ohne Gefahr des Auftretens von Blasen erzielt.For the fine sealing of a fold connection (3), in the fold gap (5) of which a flanged seam adhesive (6) curable by the supply of heat is arranged, a sealing bead (7) made of a gellable or hardenable material is applied to the free cut edge (4) of the fold connection and gelled or hardened by two heat treatments, of which the first heat treatment in a heat supply from the outside, for example by infrared radiation, and the second heat treatment in a heat supply from the inside of the metal parts (1, 2) of the folded joint (3) by inductive Insist on heating. This achieves rapid curing without the risk of bubbles appearing.

Description

Die Erfindung betrifft ein Verfahren gemäß dem Oberbegriff des Patentanspruchs 1. Es ist bekannt, Kraftfahrzeugteile, wie Türen, Kofferraumhauben, Rückwandklappen und Motorraumhauben beispielsweise aus einem Innen- und einem Außenblech mit einer Falzverbindung herzustellen, in deren Falzspalt ein durch Wärmezufuhr gelier- und/oder härtbarer Börde!- nahtkleber, enthaltend beispielsweise PVC-Plastisol, Polyacrylat-Plastisole, Epoxidharze oder Kunstkautschuk, eingebracht istThe invention relates to a method according to the preamble of claim 1. It is known Automotive parts such as doors, trunk lids, tailgate doors and engine compartment lids, for example to produce from an inner and an outer sheet with a rabbet connection, in the rabbet gap by supplying heat gellable and / or hardenable seam adhesive, containing for example PVC plastisol, Polyacrylate plastisols, epoxy resins or synthetic rubber, is introduced

Wie die Erfahrung zeigt, ist es jedoch außerordentlich schwierig, eine vollständige Ausfüllung des Falzspalts mit dem Kleber zu erzielen. Dies sowie die Tatsache, daß die freiliegende Schnittkante der Falzverbindung bei diesem bekannten Verfahren frei liegt, also nicht versiegelt wird, macht es aus Gründen des Korrosionsschutzes im Falzbereich erforderlich, zusätzliche Dichtmaßnahmen zu treffen. In der DE-OS 28 54 766, FI6B 11/00, die nicht e>;akt eine Falzverbindung betrifft, wird beiderseits einer Raupe aus Klebermatcrial eine plastisch verformbare Dichtschnur vorgesehen. Dabei wird aber ebenfalls keine Versiegelung der freiliegenden Schnittkante der Falzverbindung erzielt.As experience shows, however, it is extremely difficult to completely fill the rebate gap to achieve with the glue. This as well as the fact that the exposed cutting edge of the folded seam connection is exposed in this known method, so is not sealed, makes it for reasons of corrosion protection necessary to take additional sealing measures in the rebate area. In DE-OS 28 54 766, FI6B 11/00, which does not concern a folded joint A plastically deformable sealing cord is provided on both sides of a bead made of adhesive material. It will but also no sealing of the exposed cut edge of the folded seam is achieved.

Der Erfindung liegt mithin die Aufgabe zugrunde, ein Verfahren gemäß dem Oberbegriff des Patentanspruchs 1 zu schaffen, das unter Anwendung serienfreundlicher Maßnahmen eine Feinabdichtung des Falzspalts unter Versiegelung der freiliegenden Schnittkante der Falzverbindung gewährleistet.The invention is therefore based on the object of a method according to the preamble of the patent claim 1 to create a fine sealing of the rebate gap using series-friendly measures guaranteed by sealing the exposed cut edge of the seam connection.

Die erfindungsgemäße Lösung dieser Aufgabe besteht in den kennzeichnenden Merkmalen des Patentanspruchs I, vorteilhafte Ausbildungen dieses Verfahrens beschreiben die Unteransprüche.The solution to this problem according to the invention consists in the characterizing features of the patent claim I, advantageous developments of this method are described in the subclaims.

Betrachtet man zwecks Veranschaulichung der Erfindung — ohne daß hierdurch eine Beschränkung des erfindungsgemäßen Verfahrens auf dieses technische Gebiet ausgesprochen sein soll — weiter die Herstellung von Kraftfahrzeugkarosscrieteilen, so wird also bei dem erfinduRgsgemäßen Verfahren der Falzspalt einschließlieh der freiliegenden äußeren Schnittkante (beispielsweise eines Klappcnaußcnblechs) im Rohbau oder in der Lackiercrei durch Aufbringen einer zusätzlichen Dichlraupe aus einem durch Wärmezufuhr härtbaren Dichtmatcrial versiegelt. Bei Aufbringen dieser Dichtraupe im Rohbau ergibt sich der Vorteil, daß das Aufbringen automatisierbar und nicht wie bei Aufbringen der Dichtraupe an der — im komplettierten Zustand — grundierten Karosserie durch die Einbaulage der Klappe o. dgl. bedingt erschwert ist. Es ist jedoch erforderlieh, die Dichtraupc für die mechanischen Beanspruchungen beim Anbau des betreffenden Teils, also beispielsweise einer Klappe, an die Karosserie sowie ür nachfolgende Wasch- und Phosphatiervorgänge zu gelieren bzw. anzuhauen.If one considers for the purpose of illustrating the invention - without this thereby limiting the scope of the invention Process should be pronounced in this technical area - further the production of motor vehicle body parts, so is the Method according to the invention, including the folding gap the exposed outer cut edge (for example of a hinged outer sheet) in the shell or in the paint coating by applying an additional dichloro bead made from a hardenable material that can be hardened by the supply of heat Sealing material sealed. When applying this sealing bead In the shell there is the advantage that the application can be automated and not as with application the sealing bead on the - in the completed state - primed body through the installation position of the flap or the like. Is conditionally difficult. It is necessary, however, the Dichtraupc for the mechanical stresses when attaching the relevant part, for example a flap to gel on the body and for subsequent washing and phosphating processes or to hit.

Grundsätzlich ist es möglich, diesen Anhärtungsvorgang in einem Umluftofen vorzunehmen, wobei die gesamte Klappe oder dergleichen auf Temperaturen um 1600C erwärmt wird. Diese Methode erfordert jedoch eine Verweilzeit der Klappe in der Größenordnung von 15 Minuten im Umln/tofen. Eine Beschleunigung dieses Verfahrensschritts läßt sich grundsätzlcih durch induktive Erwärmung der Falzverbindung erzielen, jedoch stellen sich dabei, wie umfangreiche Untersuchungen gezeigt haben, im wesentlichen zwei Nachteile ein: Zum einen läßt sich auch mit induktiver Erwärmung in wirtschaftlich vertretbaren Behandlungszeiten eine GeHerung des Dichtmaterials nicht erreichen, und zum anderen durchbricht beim induktiven Erwärmen die beim Falzvorgang eingeschlossene Luft die Dichtraupe und führt zu optisch sowie korrosionsmäßig nicht vertretbaren, teilweise aufgebrochenen Blasen.In principle, it is possible to make this Anhärtungsvorgang in a forced air oven, with the entire flap or the like is heated to temperatures of about 160 0 C. However, this method requires a dwell time of the flap in the order of 15 minutes in the oven. In principle, this process step can be accelerated by inductive heating of the rebate connection, but, as extensive studies have shown, there are essentially two disadvantages: On the one hand, the sealing material cannot be increased in economically justifiable treatment times even with inductive heating, and on the other hand, during inductive heating, the air trapped during the hemming process breaks through the sealing bead and leads to optically and corrosion-unacceptable, partially broken bubbles.

Die Erfindung erschöpft sich demgemäß nicht einfach in dem Aufbringen einer Diciitraupe aus durch Wärmezufuhr gelier- und/oder härtbarem Material (das mit dem Material des Klebers übereinstimmen kann, jedoch elastischer abgestimmt sein wird), sondern beinhaltet auch eine bestimmte Aufeinanderfolge von zwei Wärmebehandlungen, die einerseits zu auch in der Großserienfertigung wirtschaftlich vertretbaren Behandlungszeiten führt und andererseits die beiden beschriebenen Nachteile mit Sicherheit vermeidet. Bei der Erfindung erfolgt also zunächst eine Wärmezufuhr zur Dichtraupe von außen her, beispielsweise durch eine etwa fünf Sekunden währende Infrarot-Bestrahlung, die zu einer Temperatur in der Größenordnung von 140°C führt, während bei der zweiten Wärmebehandlung durch induktive Erwärmung des metallenen Materials der Falzverbindung gleichsam von innen her eine Wärmezufuhr zur Dichtraupe erfolgt. Diese zweite Wärmebehandlung kann in vorteilhafter Weise zugleich zur Gelierung und/ oder Härtung des Bördelnahtklebers dienen. Die dabei erfolgende Erwärmung der beim Falzvorgang eingeschlossenen Luft hat angesichts der äußeren Vorgelierung bzw. Vorhärtung des Materials der Dichtraupe keine unerwünschte Wirkung hinsichtlich Blasenbildung. Accordingly, the invention is not limited to simply applying a diciitraupe by supplying heat gellable and / or hardenable material (which may be the same as the material of the adhesive, however will be more elastic), but also includes a certain sequence of two heat treatments, On the one hand, treatment times that are economically justifiable even in large-scale production leads and on the other hand avoids the two disadvantages described with certainty. In the invention heat is first supplied to the sealing bead from the outside, for example for about five seconds continuous infrared radiation, which leads to a temperature of the order of 140 ° C, while in the second heat treatment by inductive heating of the metal material of the folded seam heat is supplied to the sealing bead from the inside, as it were. This second heat treatment can advantageously also serve to gel and / or harden the flanged seam adhesive. The one with it The resulting heating of the air trapped during the hemming process has in view of the external pre-gelation or pre-hardening of the material of the sealing bead has no undesirable effect in terms of blistering.

Aus der DE-OS 26 20 029 ist ein Verfahren zum Herstellen eines Zusammenbaus durch Kleben hckannt, bei dem der Kleber vor dem Zusammensetzen des Zusammenbaus durch eine erste Wärmezufuhr vorgeliert und nach dem Zusammensetzen durch eine zweite Wärmezufuhr gehärtet wird. Demgegenüber wird bei der Erfindung eine zusäztlich zum Bördelnahtkleber im FalzspaltFrom DE-OS 26 20 029 a method for producing an assembly by gluing is hckannt, at which the adhesive pre-gels and prior to the assembly of the assembly by a first supply of heat is hardened after assembly by a second supply of heat. In contrast, in the invention one in addition to the flange seam adhesive in the rebate gap

an der Schnittkante der Falzverbindung aufgebrachte Dichtraupe nacheinander zwei »gerichteten« Wärmebehandlungen, nämlich durch Wärmezufuhr zunächst von außen und dann von innen, unterworfen, um ein bei H derartigen Falzverbindungen sonst auftretendes Prof| blem, nämiich die Blasenbildung durch eingeschlossene Ii Luft, zu vermeiden.sealing bead applied to the cut edge of the seam joint, two "directed" heat treatments, one after the other, namely by supplying heat first from the outside and then from the inside, subjected to a at H such seam connections otherwise occurring Prof | problem, namely to avoid the formation of bubbles due to trapped air.

•fe Anhand der Zeichnung sollen nochmals die Verhältst nisse bei dem erfindungsgemäßen Verfahren erläutert fif werden:The relationships in the method according to the invention are to be explained again with the aid of the drawing become fif:

%' Es sei wiederum angenommen, die Falzverbindung % ' Again, assume the seam connection

^ befinde sich an einer Klappe, beispielsweise für den r- Kofferraum eines Kraftfahrzeugs. Diese Klappe wird S4 gebildet durch das Außenblech 1 und das Innenblech 2, ϊ ·■ die bei 3 in üblicher Weise zur Falzverbindung gebogen t' sind. Man erkennt die äußere Schnittkante 4 des Außen-S.1 blechs 1 am Ende des Falzspalts 5. Im Falzspalt 5 befin- '<■- det sich der durch Wärmezufuhr härtbare Kleber 6, der : ■ eine feste und dichte Verbindung zwischen den beiden^ is located on a flap, for example for the r - trunk of a motor vehicle. This flap is S 4 is formed by the outer panel 1 and the inner panel 2, ϊ ■ · t bent at 3 in a conventional manner for folded seam connection are '. It can be seen, the outer cutting edge 4 of the outer-S.1 sheet 1 at the end of the folding nip 5. In Falzspalts befin- 5 '<■ - det the thermosetting adhesive supply 6 which: ■ a fixed and tight connection between the two

Blechen 1 und 3 herstellen soil.Make sheets 1 and 3.

'.'· Da es außerordentlich schwierig ist, diese Verbindung '.' · Because it is extremely difficult to establish this connection

gleichmäßig und dicht herzustellen, und da ferner die freie Kante 4 abgedeckt werden soll, wird auf diese und ' damit gleichsam auf das Ende des Falzspalts 5 die Dichtraupe 7 aus einem ebenfalls gelier- bzw. härtbaren Material aufgebracht. Zur Veranschaulichung der Abmes- , sungsverhältnisse seien als Beispiele für das Außen- und Innenblech eine Stärke von etwa 03 mm und für die Spaltweite 100 μπι genanntto be produced uniformly and tightly, and since the free edge 4 is also to be covered, the sealing bead 7, made of a material which can also be gelled or hardened, is applied to this and thus, as it were, to the end of the rebate gap 5. To illustrate the dimensional relationships , a thickness of about 03 mm and a gap width of 100 μm are mentioned as examples for the outer and inner sheet

Zur äußeren Vorgelierung bzw. Vorhärtung des Ma- to terials der Dichtraupe 7 erfolgt zunächst eine äußere \ Wärmezufuhr zu der Dichtraupe 7, bevorzugt durch eine einige Sekunden währende infrarotbestrahlung. Dadurch erfolgt also praktisch keine Erwärmung der metallenen Bestandteile der Falzverbindung 3 und damit eventuell im Falzspalt 5 beim Falzvorgang eingeschlossener Luft, so daß eine Blasenbildung nicht auftritt For external gelation or preliminary curing of the ma- terials to the sealing bead 7 is first an outer \ heat supply to the sealing bead 7, preferably ending infrared ray by a few seconds. As a result, there is practically no heating of the metal components of the folded seam connection 3 and thus any air trapped in the seam gap 5 during the seaming process, so that the formation of bubbles does not occur

Danach erfolgt eine zweite Wärmebehandlung, jedoch jetzt durch Wärmezufuhr zum Material der Dichtraupe 7 im wesentlichen von innen, d. h. von den Blechen 1 und 2, her. Dazu erfolgt eine induktive Erwärmung der Falzverbindung 3 unter Anwendung einer üblichen und daher hier nicht zu beschreibenden Induktionsschleife. Diese Wärmebehandlung, die zugleich zur Härtung des Bördelnahtklebers 6 dient, führt zur endgültigen Härtung bzw. Gelierung des Material der Dichtraupe 7, wobei die Ausdehnung eventuell im Falzspalt 5 enthaltener Luft infolge der Vorgelierung der Dichtraupe 7 nicht zur Blasenbildung führen kann.This is followed by a second heat treatment, but now by supplying heat to the material of the sealing bead 7 essentially from the inside, i.e. H. from sheets 1 and 2. For this purpose, inductive heating takes place of the folded joint 3 using a conventional induction loop which is therefore not to be described here. This heat treatment, which also serves to harden the flanged seam adhesive 6, leads to the final Hardening or gelling of the material of the sealing bead 7, the expansion possibly in the rebate gap 5 contained air can not lead to the formation of bubbles due to the pre-gelling of the sealing bead 7.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims (4)

Patentansprüche:Patent claims: 1. Verfahren zum Herstellen einer dichten Falzverbindung mittels eines durch Wärmezufuhr gclier- und/oder härtbaren Bördelnahtklcbcrs im Falzspalt und mittels einer diesem vorgeschalteten Dichtung, dadurch gekennzeichnet, daß als Dichtung eine Raupe (7) aus durch Wärmezufuhr gelier- und/ oder härtbarem Material an einer Schnittkante (4) der Falzverbindung (3) aufgebracht und nacheinander einer ersten Wärmebehandlung durch Wärmezufuhr im wesentlichen zu ihrer freien äußeren Oberfläche und einer zweiten Wärmebehandlung durch Wärmezufuhr im wesentlichen von der Falzverbindung (3) her zu ihrer inneren Haftfläche unterzogen wird.1. Method for producing a tight seam connection by means of a gclier- and / or hardenable flanged seam clips in the rebate gap and by means of a seal upstream of this, characterized in that as a seal a bead (7) made of material that can be gelled and / or hardened by the supply of heat on a cut edge (4) applied to the folded joint (3) and successively a first heat treatment by supplying heat essentially to its free outer surface and a second heat treatment by supplying heat essentially from the folded seam connection (3) to its inner adhesive surface will. 2. Verfahren nach Anspruch I, dadurch gekennzeichnet, izi bei der zweiten Wärmebehandlung zugleich die Gelierung und/oder Härtung des Bördelnahtklebers (6) erfolgt2. The method of claim I, characterized in izi in the second heat treatment at the same time the gelation and / or curing of the Bördelnahtklebers (6) is carried out 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Wärmezufuhr bei der ersten Wärmebehandlung durch Infrarotbestrahlung der Raupe (7) erfolgt.3. The method according to claim 1 or 2, characterized in that the heat supply in the first Heat treatment is carried out by infrared irradiation of the bead (7). 4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Wärmezufuhr bei der zweiten Wärmebehandlung durch induktive Erwärmung der Falzverbindung (3) erfolgt4. The method according to any one of claims 1 to 3, characterized in that the heat supply at the second heat treatment is carried out by inductive heating of the folded seam connection (3)
DE3238651A 1982-10-19 1982-10-19 Method for producing a tight fold connection Expired DE3238651C2 (en)

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DE10116719A1 (en) * 2001-04-04 2002-10-31 Bayerische Motoren Werke Ag Method of sealing a flanged seam
DE10116721A1 (en) * 2001-04-04 2002-12-05 Bayerische Motoren Werke Ag Method of sealing a flanged seam
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DE19825707B4 (en) * 1997-06-19 2010-02-04 Volkswagen Ag Dense seam connection for two sheets
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DE10109551A1 (en) * 2001-02-28 2002-09-05 Bayerische Motoren Werke Ag Sealing method for folded seam connection of sheet metal panels with local heating of seam directly before application of sealant layer
DE10116719A1 (en) * 2001-04-04 2002-10-31 Bayerische Motoren Werke Ag Method of sealing a flanged seam
DE10116721A1 (en) * 2001-04-04 2002-12-05 Bayerische Motoren Werke Ag Method of sealing a flanged seam
DE102006033751A1 (en) * 2006-07-21 2008-01-24 Audi Ag Car bodywork component consists of inner component and outer component with section which is folded back over edge of inner component, inner component having embossed rib, against which inside of folded section rests
DE102006033751B4 (en) * 2006-07-21 2008-04-30 Audi Ag Body part for a vehicle, in particular for a motor vehicle
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